Job Idea: Medic (Healer)

[Seraphor]

I like the job fantasy for this, it's different from most 'Chemist' ideas, more 'edgy' I guess.

A few issues though:

Not sure how the stance change turning DPS skills into healing spells would work in practice. It sounds quirky, but I can see various cases of people fumbling their stances and failing to heal when needed. It's basically the old Cleric stance taken to the extreme.
It could work for a couple of select oGCD abilities, kinda like how Earthly Star is a healing/dps skill at once, you could have a couple of oGCD's that can be one or the other depending on stance, but not the core healing kit.

Instead, I'd say the Stash/Mix should be a GCD. Perhaps using a Shell does nothing on it's own, just adds the effect to the gauge, then you can use the 'Use/Mix' GCD ability to either use the single shell or mix two together and use the combined effect instead. You're then weaving your Shells to fuel your GCD heal.
This way, Use/Mix becomes your 'advanced heal' option, akin to Aspected Benefic and Aspected Helios combined.

Finally, they've gutted our ability to regenerate other peoples MP, so that's not likely to happen. You could replace that with either a Regen or Shield effect.